Disclosed is a method for designing a virtual mould used for manufacturing a corresponding physical mould adapted to be used in manufacturing of a dental restoration for a patient, wherein the method comprises: - obtaining a 3D representation of the patients set of teeth comprising a restoration site where the manufactured dental restoration is adapted to be arranged - virtually designing at least a first layer and a second layer of the dental restoration, where the first layer is part of a first portion of the dental restoration, and where the combination of the first portion and the second layer provides at least part of the dental restoration and - virtually designing the mould, which is adapted for the manufacturing of the second layer, where the inside surface of the mould is adapted to match the combination of at first portion and the second layer, where the inside surface of the mould corresponds to the shape of the dental restoration, where virtually designing the mould comprises designing a virtual retention structure of the mould, where the corresponding physical retention structure is applicable in retaining the first portion of the dental restoration in its correct position in the mould.Linvention concerne un procédé de conception dun moule virtuel utilisé pour la fabrication dun moule physique correspondant conçu pour être utilisé dans la fabrication dune restauration dentaire pour un patient, le procédé comprenant : - lobtention dune représentation tridimensionnelle (3D) de lensemble de dents du patient comprenant un site de restauration dans lequel doit être agencée la restauration dentaire fabriquée - la conception virtuelle dau moins une première couche et dune seconde couche de la restauration dentaire, la première couche faisant partie dune première partie de la restauration dentaire, et la combinaison de la première partie et de la seconde couche créant au moins une partie de la restauration dentaire et - la conception virtuelle du moule, qui e
